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研究生： 王人傑
Wang, Jen-Chieh
論文名稱： 在MPEG-4 串流上依據熵 選擇物件之自動加密機制
Entropy-based Object Selection and Automatic Encryption Mechanism in MPEG-4 Streaming
指導教授： 侯廷偉
Hou, Ting-Wei
學位類別： 碩士
Master
系所名稱： 工學院 - 工程科學系
Department of Engineering Science
論文出版年： 2004
畢業學年度： 92
語文別： 中文
論文頁數： 56
中文關鍵詞： 熵值 、加密
外文關鍵詞： MPEG-4, entropy
相關次數： 點閱：69  下載：2 
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    • 　　本論文提出一種新的多媒體資料加密技術，來保護資料的安全性。本論文
    使用熵值來找出影像中哪些物件是有動作的，認為這些正在移動的物件是影像
    中比較重要的部分，因此將這些物件作加密處理。這個技術可以應用在
    MPEG-1、MPEG-2 和MPEG-4 上面。本論文另一個重點是在於經過加密的
    MPEG-4 檔案還是相容於MPEG-4 標準。因此符合MPEG-4 標準的播放器都可
    以撥放加密之後的檔案。此方法並不需要對所有的影像資料作加密，只需要加
    密資料中比較重要的部分，因此可以避免因為加密造成的計算負擔，也可以達到即時的效果。

    　　This paper presents a new approach to encrypt multimedia data. We adopt
    entropy to find motion objects, under the assumption that motion objects are more
    important ones We then encrypt those whose entropy values are higher than a
    threshold. This new technology can be applied to MPEG-1, MPEG-2 and MPEG-4
    standards. The encrypted files conform to original MPEG file formats. This
    approach only encrypts part of the multimedia data, such that it avoids additional
    computing overhead, and it can reach real-time processing.

    中文摘要.....................................................................................................................i Abstract .......................................................................................................................ii 誌謝............................................................................................................................iii 章節目錄....................................................................................................................iv 圖目錄........................................................................................................................vi 表目錄.......................................................................................................................vii 第一章緒論...............................................................................................................1 1.1 研究動機與背景.........................................................................................1 1.2 研究目的......................................................................................................2 1.3 章節概要......................................................................................................3 第二章系統介紹.......................................................................................................4 2.1 VOD 系統介紹.............................................................................................4 2.2 觀賞收費系統..............................................................................................6 2.3 系統架構.......................................................................................................7 第三章MPEG-4 架構介紹.......................................................................................9 3.1 MPEG-4 標準...............................................................................................9 3.1.1 簡介...................................................................................................9 3.1.2 MPEG-4 系統架構..........................................................................11 3.2 MPEG-4 的視訊.........................................................................................13 3.2.1 MPEG-4 的視訊體系......................................................................13 3.2.2 視訊設定檔....................................................................................14 3.2.3 視訊物件的編碼方式....................................................................15 3.3 MPEG-4 檔案格式.....................................................................................22 3.3.1 物件描述架構................................................................................22 3.3.2 檔案格式介紹................................................................................24 3.3.3 檔案格式結構................................................................................25 3.3.4 計算MPEG-4 之熵值....................................................................27 第四章熵值介紹.....................................................................................................29 4.1 信息理論....................................................................................................29 4.2 熵值原理....................................................................................................30 第五章加密機制設計............................................................................................35 5.1 相關技術....................................................................................................35 5.1.1 MPEG 檔案內容的保護.................................................................35 5.1.2 影像加密法的演化........................................................................36 5.2 加密觀念....................................................................................................37 5.2.1 運動向量........................................................................................37 5.2.2 使用熵值偵測物件........................................................................37 5.2.2 物件加密........................................................................................39 5.2.3 加密演算法....................................................................................41 5.3 實作與測試................................................................................................42 5.3.1 以整個框架來計算........................................................................42 5.3.2 將框架切割....................................................................................45 5.3.3 計算MPEG-4 檔案中的熵值........................................................48 第六章結論與未來工作........................................................................................52 6.1 結論............................................................................................................52 6.2 未來工作....................................................................................................52 參考文獻...................................................................................................................54 自述...........................................................................................................................56

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